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It's a split decision.
Choose Prometheus if your stack centers on metrics, PromQL, and instrumented services, and you want independent servers with local storage under Apache 2.0. Choose Zabbix if you need one monitoring system across IT and OT, data centers, cloud, and edge, or want a managed cloud option. Both offer free self-hosted software. Your practical cost is infrastructure and operations for self-hosting; Zabbix Cloud pricing is not published on its homepage.
01Side by side
| Prometheus | Zabbix | |
|---|---|---|
| Pricing model | $0; no listed usage or seat fees | $0 self-hosted; no license fees |
| Free tier | Open source; no usage limits imposed | Unlimited hosts, users, metrics, and alerts |
| Open source and license | Open source under Apache 2.0 | Open source; homepage does not name license |
| Self-hosting | Independent servers use local storage | On-premise deployment on your infrastructure |
| Integrations | Hundreds of official and community integrations | AWS, Azure, Google Cloud, and more |
| Deployment model | Self-hosted servers | On-premise, managed cloud, or public cloud |
| Platforms | Web; Kubernetes and cloud/container managers | Web; AWS, Azure, Google Cloud, and more |
| Limits and scaling | No usage limits imposed | Unlimited monitored entities, users, metrics, and alerts |
Prometheus Choose Prometheus if
- Choose Prometheus if you need PromQL-based metrics queries and alerts.
- Choose Prometheus if you want independent servers with local storage.
- Choose Prometheus if Apache 2.0 licensing matters to your stack.
Zabbix Choose Zabbix if
- Choose Zabbix if you monitor IT and OT infrastructure together.
- Choose Zabbix if you need on-premise, managed cloud, or public-cloud options.
- Choose Zabbix if unlimited monitored hosts and users fit your deployment.
02Pricing at real usage
Both can start at $0 for self-hosted use. Prometheus is free under Apache 2.0, with no seat or usage limits imposed, and its pricing page lists $0 per month; it does not list annual billing. Zabbix’s self-hosted open-source plan is also $0 monthly and annually, with unlimited monitored hosts, devices, applications, users, metrics, and alerts, and no license fees. For either self-hosted system, the license price does not cover infrastructure and operating work: Prometheus servers use local storage and run independently, while Zabbix is deployed on your infrastructure. Those costs depend on your compute, storage, and staffing choices, not a published per-metric rate. Zabbix Cloud is managed, but its price is not published; ask Zabbix for a quote at your expected scale.
03API, SDKs and integration
Prometheus centers on a dimensional metrics model and PromQL, which queries, correlates, and transforms time-series data for visualizations and alerts. It has official and community-contributed instrumentation libraries for most major languages, plus hundreds of integrations for extracting metrics from existing systems. Its homepage does not specify a public API, SDK package list, or CLI details, so check the documentation for the interface and language support your implementation needs. Zabbix describes monitoring existing systems and infrastructure across AWS, Azure, Google Cloud, data centers, and edge environments. Its homepage does not specify API styles, SDKs, or CLI details either; confirm those requirements against Zabbix documentation before designing an integration. The distinction in the published feature set is clearer at the monitoring layer: Prometheus emphasizes instrumented metrics and PromQL, while Zabbix emphasizes unified infrastructure monitoring and automated discovery.
04Open source, self-hosting and lock-in
Prometheus is open source under the Apache 2.0 license. Its servers operate independently and rely on local storage, which gives teams control over where they run them and store metrics. Zabbix is open-source software with a self-hosted on-premise option; its homepage does not name the license. It also offers Zabbix Cloud as a managed service and supports deployment on public cloud platforms. Neither homepage specifies a data-export format or migration path, so ask about export and retention requirements before adopting either system. Self-hosting reduces reliance on a hosted monitoring service, but it does not make migration automatic: your queries, alert rules, integrations, and operational configuration still need to be accounted for. Prometheus’s published license and independent-server model make its deployment boundaries explicit; Zabbix offers a choice between self-management and managed hosting.
Questions people ask
What can you monitor with Prometheus?
Prometheus is designed to monitor applications, systems, and services, including cloud-native environments. It collects and stores metrics, supports PromQL queries and alerting rules, and integrates with Kubernetes, cloud and container managers, and existing systems through hundreds of integrations.
What are the downsides of using Zabbix?
Zabbix is free to self-host, but on-premise deployment means your team handles the infrastructure and operations. Its homepage does not publish Zabbix Cloud pricing or specify API and SDK details, so confirm those costs and integration requirements before choosing a deployment.
Are Prometheus and Grafana the same thing?
No. Prometheus is an open-source system for collecting, storing, and querying metrics, with PromQL-based alerting. Its homepage also identifies dashboarding as a use case, but does not describe Grafana’s features or how the two products integrate; check their documentation for that architecture.
What is Prometheus vs Splunk?
Prometheus is an open-source metrics and monitoring system built around time-series data and PromQL. A full comparison with Splunk depends on the specific Splunk product, pricing, and integration requirements you are evaluating; verify those details with Splunk before comparing total operating cost.